Electric vehicle and method and system for maintenance control of range extender in electric vehicle

The invention discloses an electric vehicle and a method and a system for maintenance control of a range extender in the electric vehicle. The method includes steps: acquiring an engine compartment cover state and a current gear position of the electric vehicle, and acquiring accelerator pedal information and brake pedal information of the electric vehicle; when an engine compartment cover of the electric vehicle is in an open state and the electric vehicle is in a neutral gear position currently, judging whether the range extender enters a maintenance control mode or not according to the accelerator pedal information and brake pedal information of the electric vehicle; if the range extender enters the maintenance control mode, controlling an engine and a power generator in the range extender to start the engine, and controlling the engine to operate under different conditions, so that detection and maintenance of the range extender are realized. The electric vehicle and the method and the system for maintenance control of the range extender in the electric vehicle have advantages that difficulty in maintenance of the range extender is effectively lowered, possibility that the range extender enters the maintenance control mode due to misoperation of a user can be lowered, and safety of the vehicle is guaranteed beneficially.